feat: analytics parity — tool cost, date ranges, budgets, query explorer, replay, snapshots (v2.4.0)

Analytics parity phases 2–7 (docs/plans/analytics-parity/), built on
138e706 and ported onto v2.3.1:
- Cost by AI tool (?tool= on cost/analytics/stats/workflows, by_tool,
  Codex fast/priority and flex tiers, agenthub_cost_usd_total{tool,model})
- Date ranges (from/to) on cost/analytics/workflows; Analytics range select
  with Today / This week (Monday) / This month (1st) / 7d / 30d / 90d / All /
  Custom; workflow filters carried into workflow-stats.js (read worker)
- Budgets and cost alerts as alert rule types (alert_rules rebuilt without
  its rule_type CHECK), GET /api/budgets/status, rule preview, spend pace,
  status-bar budget chip; rules stay editable in place
- Query Explorer (/query, allowlisted sort, CSV/JSON export) and scheduled
  reports (report_definitions/report_runs, Settings → Reports)
- Session Replay tab and immutable snapshots (session_snapshots, /snapshot/:token)
- Remote Codex sync, push ingest with a hashed token, privacy redaction and
  ignored folders (Settings → Data), Cursor sessions (no cost)
- Read-only MCP server, statusline, Grafana/Prometheus files

Also: resizable sidebar, pet run/wave animations, the workspace home keeps a
half-typed prompt, and the pre-commit hook runs only the related tests for a
small commit.

docs/README.md

@@ -47,7 +47,9 @@ graph TB
 | [API.md](./API.md) | REST API endpoints (sessions, agents, events, stats, analytics, hooks, pricing, workflows, settings, import history, **cc-config**, **run**), WebSocket protocol (including `run_stream` / `run_status` / `run_input_ack` for the Run page) | Integration developers |
 | [DATABASE.md](./DATABASE.md) | SQLite schema, queries, performance | Database administrators |
 | [HOOKS.md](./HOOKS.md) | Claude Code hook system integration | Hook developers |
-| [MCP.md](./MCP.md) | MCP server setup and tool reference | MCP integrators |
+| [MCP.md](./MCP.md) | The read-only MCP server (`agenthub mcp`): setup and tool reference | MCP integrators |
+| [STATUSLINE.md](./STATUSLINE.md) | The Claude Code statusline (`agenthub statusline install`) | Claude Code users |
+| [MONITORING.md](./MONITORING.md) | Prometheus rules + Grafana boards for `/api/metrics`, `docker-compose.monitoring.yml` | Operators |
 | [I18N.md](./I18N.md) | Language architecture, locale strategy, and rollout checklist | Frontend and product teams |
 | [CLI.md](./CLI.md) | `agenthub` command reference — monitoring, browsing, insights, alerts, pricing, import, administration | Terminal users and CI scripting |
 
@@ -139,6 +141,7 @@ graph TB
 
 - [API.md](./API.md) - Complete API reference
 - [MCP.md](./MCP.md) - MCP server integration
+- [MONITORING.md](./MONITORING.md) - Prometheus + Grafana
 - [HOOKS.md](./HOOKS.md) - Custom hook integration
 
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